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179 lines
7.1 KiB
C
179 lines
7.1 KiB
C
/** @file
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Provides services to enable and disable periodic SMI handlers.
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Copyright (c) 2011 - 2018, Intel Corporation. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#ifndef __PERIODIC_SMI_LIB_H__
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#define __PERIODIC_SMI_LIB_H__
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#define PERIODIC_SMI_LIBRARY_ANY_CPU 0xffffffff
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/**
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This function returns a pointer to a table of supported periodic
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SMI tick periods in 100 ns units sorted from largest to smallest.
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The table contains a array of UINT64 values terminated by a tick
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period value of 0. The returned table must be treated as read-only
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data and must not be freed.
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@return A pointer to a table of UINT64 tick period values in
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100ns units sorted from largest to smallest terminated
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by a tick period of 0.
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**/
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UINT64 *
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EFIAPI
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PeriodicSmiSupportedTickPeriod (
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VOID
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);
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/**
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This function returns the time in 100ns units since the periodic SMI
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handler function was called. If the periodic SMI handler was resumed
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through PeriodicSmiYield(), then the time returned is the time in
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100ns units since PeriodicSmiYield() returned.
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@return The actual time in 100ns units that the periodic SMI handler
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has been executing. If this function is not called from within
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an enabled periodic SMI handler, then 0 is returned.
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**/
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UINT64
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EFIAPI
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PeriodicSmiExecutionTime (
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VOID
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);
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/**
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This function returns control back to the SMM Foundation. When the next
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periodic SMI for the currently executing handler is triggered, the periodic
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SMI handler will restarted from its registered DispatchFunction entry point.
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If this function is not called from within an enabled periodic SMI handler,
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then control is returned to the calling function.
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**/
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VOID
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EFIAPI
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PeriodicSmiExit (
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VOID
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);
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/**
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This function yields control back to the SMM Foundation. When the next
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periodic SMI for the currently executing handler is triggered, the periodic
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SMI handler will be resumed and this function will return. Use of this
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function requires a seperate stack for the periodic SMI handler. A non zero
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stack size must be specified in PeriodicSmiEnable() for this function to be
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used.
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If the stack size passed into PeriodicSmiEnable() was zero, the 0 is returned.
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If this function is not called from within an enabled periodic SMI handler,
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then 0 is returned.
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@return The actual time in 100ns units elapsed since this function was
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called. A value of 0 indicates an unknown amount of time.
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**/
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UINT64
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EFIAPI
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PeriodicSmiYield (
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VOID
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);
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/**
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This function is a prototype for a periodic SMI handler function
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that may be enabled with PeriodicSmiEnable() and disabled with
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PeriodicSmiDisable().
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@param[in] Context Content registered with PeriodicSmiEnable().
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@param[in] ElapsedTime The actual time in 100ns units elapsed since
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this function was called. A value of 0 indicates
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an unknown amount of time.
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**/
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typedef
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VOID
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(EFIAPI *PERIODIC_SMI_LIBRARY_HANDLER) (
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IN CONST VOID *Context OPTIONAL,
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IN UINT64 ElapsedTime
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);
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/**
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This function enables a periodic SMI handler.
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@param[in, out] DispatchHandle A pointer to the handle associated with the
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enabled periodic SMI handler. This is an
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optional parameter that may be NULL. If it is
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NULL, then the handle will not be returned,
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which means that the periodic SMI handler can
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never be disabled.
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@param[in] DispatchFunction A pointer to a periodic SMI handler function.
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@param[in] Context Optional content to pass into DispatchFunction.
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@param[in] TickPeriod The requested tick period in 100ns units that
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control should be givien to the periodic SMI
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handler. Must be one of the supported values
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returned by PeriodicSmiSupportedPickPeriod().
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@param[in] Cpu Specifies the CPU that is required to execute
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the periodic SMI handler. If Cpu is
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PERIODIC_SMI_LIBRARY_ANY_CPU, then the periodic
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SMI handler will always be executed on the SMST
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CurrentlyExecutingCpu, which may vary across
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periodic SMIs. If Cpu is between 0 and the SMST
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NumberOfCpus, then the periodic SMI will always
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be executed on the requested CPU.
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@param[in] StackSize The size, in bytes, of the stack to allocate for
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use by the periodic SMI handler. If 0, then the
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default stack will be used.
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@retval EFI_INVALID_PARAMETER DispatchFunction is NULL.
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@retval EFI_UNSUPPORTED TickPeriod is not a supported tick period. The
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supported tick periods can be retrieved using
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PeriodicSmiSupportedTickPeriod().
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@retval EFI_INVALID_PARAMETER Cpu is not PERIODIC_SMI_LIBRARY_ANY_CPU or in
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the range 0 to SMST NumberOfCpus.
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@retval EFI_OUT_OF_RESOURCES There are not enough resources to enable the
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periodic SMI handler.
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@retval EFI_OUT_OF_RESOURCES There are not enough resources to allocate the
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stack speficied by StackSize.
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@retval EFI_SUCCESS The periodic SMI handler was enabled.
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**/
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EFI_STATUS
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EFIAPI
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PeriodicSmiEnable (
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IN OUT EFI_HANDLE *DispatchHandle, OPTIONAL
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IN PERIODIC_SMI_LIBRARY_HANDLER DispatchFunction,
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IN CONST VOID *Context, OPTIONAL
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IN UINT64 TickPeriod,
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IN UINTN Cpu,
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IN UINTN StackSize
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);
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/**
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This function disables a periodic SMI handler that has been previously
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enabled with PeriodicSmiEnable().
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@param[in] DispatchHandle A handle associated with a previously enabled periodic
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SMI handler. This is an optional parameter that may
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be NULL. If it is NULL, then the active periodic SMI
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handlers is disabled.
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@retval FALSE DispatchHandle is NULL and there is no active periodic SMI handler.
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@retval FALSE The periodic SMI handler specified by DispatchHandle has
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not been enabled with PeriodicSmiEnable().
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@retval TRUE The periodic SMI handler specified by DispatchHandle has
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been disabled. If DispatchHandle is NULL, then the active
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periodic SMI handler has been disabled.
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**/
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BOOLEAN
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EFIAPI
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PeriodicSmiDisable (
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IN EFI_HANDLE DispatchHandle OPTIONAL
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);
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#endif
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